Formal:
* Trimming: This is a general term for removing branches or leaves, often used for routine maintenance.
* Thinning: This specifically refers to removing branches to improve air circulation and light penetration within the tree.
* Heading back: This involves cutting back branches to encourage denser growth.
* Pollarding: This is a technique used to control the height of trees by cutting back branches to a specific point each year.
Informal:
* Cutting back: This is a simple and straightforward term for removing branches.
* Shaping: This implies a more artistic approach to pruning, aiming to create a specific form.
* Debranching: This specifically refers to removing branches.
* Topping: This is a harsh pruning technique that cuts off the top of a tree, which is generally discouraged due to its damaging effects.
Other options:
* Managing: This term implies a more holistic approach to caring for the tree, which includes pruning.
* Maintaining: This emphasizes the ongoing care needed for a healthy tree.
The best word to use will depend on the specific situation and the effect you want to create.